Martin, maybe for inside repairs of non structural but not for transoms or holes??
Most likely if they bought it in 55 gallon drums it was an epoxy base.
I have seen Seado's repaired with polyester and small fiberglass boats.
Could well be?
Most major marine suppliers (industrial not your walk in stores) Don't even stock polyester in 55 gallon drums.
I guess thats why you west coats guys make a higher hourly rate
than us guys on the east coast- Your just better!!!
Maybe our water is different?
I don't get into fiberglass body cars but what are these guys using to mold the body's? They could use either but I would hope epoxy.